It adopts the outer structure of unsaturated polyester material, has the protection effect of outdoor anti-condensation, and is fully sealed (protection grade IP67). The principle of the control circuit is a microcomputer type. The same pole is installed under the main body of the circuit breaker, and is connected with the main body of the circuit breaker by a fully sealed aviation plug.

The SMS-PL column vacuum load switch and the SMS-PVl and SMS-PVh on-column vacuum circuit breakers are a new generation of on-column switches that have been fully developed by domestic and foreign advanced technology and mature experience. Excellent breaking performance, excellent The electrical characteristics, high reliability and long-term maintenance-free, suitable for three-phase AC 50Hz, 12kV or less power lines, as a protection control device for breaking, closing line load current, overload current and breaking short-circuit current.